The bottom line it is an advertisement. Some things will be true [Ex. 12 Unit apartment, listing price]. Some will be opinion: [Ex. Excellent Investment opportunity]. Some will be stretching the truth: [Ex. 190K after debt, expenses].
A good rule of thumb, in rental real estate is to count on half of potential rental income. This will cover unknowns such as vacancies and repairs; and, knowns such as taxes and common area cleaning. As such, you have a return of about 6% if you were able to pay cash (142K/2100K). That is good, but not great. Your ROI would be a lot less if you had a loan.
Its likely that clearing 190K/year is only possible if you manage the property yourself and have no vacancies or repairs. This would include cleaning the common areas. That is a lot of work and you have to be lucky. Never mind the fact you have to qualify to borrow 2.1 million. This will probably be on top of a loan on your family home.
So if you had 2.1 million, you could live quite comfortably on the income off of this investment. If you had no other significant investments you would not be diversified.
If you could borrow 2.1 million, you could probably break even or better and in 20 to 30 years have an investment that could provide you with a nice living. You could accelerate the time frame by doing much of the work yourself or even living in the property.